<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>分区标签练习</title>
</head>
<body>
<div>头部</div>
<div>主体
    <div>分区1</div>
    <div>分区2</div>
    <div>分区3</div>
</div>
<div>脚部</div>

<header>头部</header>
<article>主体
    <div>分区1</div>
    <div>分区2</div>
    <div>分区3</div>
</article>
<footer>脚部</footer>

<span>span1</span> <span>span2</span>
</body>
</html>